Sharpening device



Jan. 26, 1943. o. D. PREM@ SHAPENING DEVICE 4Filed Nov. ,4, 1940( 3 Sheets-Sheet l zeizlbiwrza I N VEN TOR.

A TTORNEYS.

Jan. 26,1943, I` o, m. PREMO' 2,309,272

' SHAHPENING DEVICE l Filled Nov. 4, 1940` s sheets-shea; 2

Y ATTORNEYS.

Jan. 26v 1943. o. D. PREMo SHARPENING DEVICE Filed Nov, 4, 1940 3 Sheets-Sheet 3 NVEN TOR.

ATTORNEYS.

Patented Jan. 26, 1943 UNITED STATES PATENT OFFICE SHARPENING DEVICE Owen D. Premo, Muskegon Heights, Mich. Application November 4, 1940, Serial No. 364,289

1 Claim.

This invention relates to sharpening devices, the primary object of the invention being to provide means whereby an accurate tapered point will be formed on pencils or similar objects inserted in the device for sharpening.

An important object of theinvention is to provide a device of this character which will move the pencil being sharpened, longitudinally of the sharpening blades of the device, which are elongated and which rotate in contact with the article being sharpened.

Another object of the invention is to provide a device of this character which may be used in sharpening blades as Well as pencils or similarly shaped articles.

A still further object of the invention is to provide a sharpening device including a body portion constructed of a plurality of movable sections pivotally connected, and so arranged that when the body portion is swung to its open position, the blade of a knife may be easily held in position to be engaged by the sharpening members of the device to form a cutting edge.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts Iand in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein described, may be made within the scope of what is claimed, Without departing from the spirit of the invention.

Referring to the drawings:

Figure 1 is a plan view of a sharpening device constructed in accordance with the invention.

Figure 2 is a vertical sectional view taken on line 2-2 of Figure 1. v

Figure 3 is a sectional view taken on line 3 3 of Figure l.

Figure 4 is a sectional view taken on line 4-4 of Figure 2.

Figure 5 is a detail perspective View illustrating one of the shafts that support sharpening blades.

Figure 6 is a vertical sectional View through a modified form of the invention.

Figure 7 is a sectional view taken on line 1-1 of Figure 6.

Figure 8 is a sectional view through a further modified form of the invention.

Figure 9 is a sectional view taken on line 9-9 of Figure 8.

Figure 10 is an elevational view illustrating a still further modied form of the invention showing the particular type of sharpening device as extended for use in sharpening knife blades.

Figure 11 is a longitudinal sectional view through the modified form of the invention as shown by Figure l0 of the drawings, the section being taken on the line II-II of Figure 10.

Figure 12 is a vertical sectional view through the modied form of the sharpening device illustrating the sharpening device as in its folded condition.

Figure 13 is `a perspective View of a modified form of sharpening blade to be used in the device.

Referring to the drawings in detail, the sharpening device comprises a body portion indicated generally by the reference character 5, the body portion including a lower receiving section 6, and an upper sharpening section 1, .the upper sharpening section 'I being hingedly connected to the lower receiving section 6, as clearly shown by Figure 2 of the drawings.

Mounted within the upper sharpening section 7, are spaced parallel shafts 8 which have their ends mounted in bearings formed in the side walls of the upper sharpening section. Gears 9 and I are mounted on the shafts 8, the gears being in mesh, so that rotary movement of one shaft will produce a rotary movement of the opposite shaft, the shafts moving in opposite directions.

Positioned on each shaft 8, is a sleeve I I, which sleeve is formed with elongated cut-out portions extending from one end thereof and terminating at a point spaced from the opposite end of the sleeve. These cut-out portions are indicated by the reference character I2 and are Iarranged in predetermined spaced relation with each other providing supports for the flexible sharpening blades I3. The blades I3 are held in position by means of the collars I4 and I5, which are mounted on the ends of the sleeve and engage the ends of the blades I3. Mounted Within the upper portion of the sharpening section l, is a partition I6 that divides the upper sharpening section into a gear casing at the upper end of the body portion. Mounted within the gear casing, is a barrel Il which is formed With an annular ange I8 that bears against the inner surface of the top of the body portion. A shoulder indicated at I9 is lformed on the opposite end of the barrel I7 and engages the partition I 6, holding the barrel in position. The ange I8 is formed with teeth, providing a gear meshing with the teeth of the bar 20 which is mounted within the gear casing.

The reference character 2| designates a yoke which encircles the barrel II, the yoke having an extension 22 formed with an opening, through which the axial camy shaft 23 extends, the axial cam shaft 23 having oppositely disposed threads in which the pin 24 moves, the pin 24 being carried by the threaded plug 25 threaded in an opening of the extension 22. Due to this construction, it Will be seen that by removing the plug 25 the pin 24 will be disengaged from the threads of the shaft 23 allowing the device to be disassembled.

A gear indicated at 26 is mounted on one end of the axial cam shaft 23 and is in mesh with the gear I, so that as the gear It is rotated, the axial cam shaft 23 will be likewise rotated causing the yoke 2i) to reciprocate transversely of the body portion. Since the barrel l1 'is mounted within the yoke, and the barrel H provides a support for a pencil being sharpened, it is obvious that the pencil will be moved transversely of the body portion and longitudinally of the cutting blades, as they are rotated. A crank indicated by the reference character 2l is mounted on one end of the shaft 3 directly under the gear 25, whereby rotary movement may be imparted to the shaft.

From the foregoing it will be seen that a pencil inserted in the barrel will be sharpened with an accurate tapered point, when the shafts S are rotated moving the blades over the end of the pencil to be sharpened. In the form of the invention as illustrated by Figures 6 and 'I of the drawings, the body portion comprises a lower lsection 28 and an upper section 2d, the upper section being hingedly connected to the lower section by means of the hinge St. The upper and lower sections are formed with inwardly extended flanges 3i that contact when the upper and lower sections are moved to their closed positions, or to the positions shown by Figure 6 of the drawings. A spring catch indicated at 32 is carried by the upper section, and is adapted to engage over one edge of the lower section, holding the sections in their closed positions.

Mounted within the upper and lower sections, are spaced parallel shafts 33 and 35, the shafts being provided with meshing gears 35 so that rotary movement of one shaft will produce rotary movement of the remaining shafts, to accomplish the purpose of the invention.

Sharpening blades indicated at 35i are mounted on the shafts and 3d, and operate in such relation with each other that they will intermittently move over the opposite faces of a blade supported within the body portion to be sharpened. In Figure 6 of the drawings, I have indicated a single edge razor blade 3l as positioned within the blade holder 33, forming a part of the device. In this view I have also indicated a holder at 39 which is constructed to support the' usual doubie edge razor blade in such a way that the sharpening blades willV wipe the cutting edges of the double edged blade sharpening them.

As shown by Figure 8 of the drawings, a nous'- ing is indicated by the reference character liil. In the. housing d parallel shafts il are mounted, the shafts having gears d2 that are in mesh so that rotary movement of one shaft Ywill produce a relative rotary movement of the adjacent shaft in the opposite direction.

Sharpening members i3 are carried by these shafts and are adapted to wipe the cutting edge of the blade which is shown as supported in the holder it in such a way that the cutting edge thereof will lie in the path of travel of the sharpening members 43 to sharpen. the blade. The holder is in the form of a slot provided in the of the drawings.

upper surface of the body portion, the edges of the slot being extended downwardly in parallel relation with each other to contact with opposite sides of the blade positioned in the slot.

In the form of the invention as shown by Sheet 3 of the drawings, the body portion of the sharpener comprises an inner section 4A. and lateral sections 45. Shafts 46 extend through the sections and provide supports for the sharpening members el which are shown as radiating therefrom. Links i8 have openings to receive the shafts 6, the links providing means for holding the sections together in such a way that they may be swung from the position shown in Figure 10 of the drawings, to the folded position as shown by Figure l2. Gears indicated at 4Q are provided on the shafts '25, the gears being in mesh so that rotary movement of the shaft 46 at one end of the body portion, will result in rotary movement being imparted to the remaining shafts, alternate shafts being rotated in opposite directions.

When the device is used in its open position as shown by Figure l0 of the drawings, the device is especially designed for sharpening knife blades which are held between adjacent shafts in such a way that the sharpening members will contant with the blade being sharpened, as the shafts are rotated. Due to this construction, it will be seen that the end sections i5 of the sharpening device may be swung upwardly to the positions shown by Figure l2 of the drawings whereupon the latch memberv i9 will engage within the keeper formed in the opposite end section, securing the sections in this folded conditionA ""*hen the sections are folded as shown by Figure l2, the knife blade may be inserted 4witl'iin the space between adjacent sections, so that the blade under treatment will be engaged by the various sharpening members to accomplish the purpose of the invention.

In Figure 13 I have illustrated a rigid sharpening member which may be used in lieu of the flexible' sharpening members shown in Figure 12 The rigid sharpening member is indicated by the reference character 5i?, and is formed preferably of a length of metal covered by a length of cloth material carrying an abrasive for sharpening purpose-s.

In View of the foregoing detail disclosure, it is believed that a further disclosure as to the operation of the device is unnecessary.

What is claimed is:

In a sharpening device, a hollow body portion, a pair of parallel horizontal shafts mounted for rotary movement within the body portion, a crank handle secured to one of the shafts for operating the shaft, gears on the shafts and adapted to mesh, whereby rotary movement of one shaft is transmitted to the other shaft, exible abrading blades mounted on the shaft, said 4blades having one of their longitudinal edges secured adjacent toy the shaft, and extending therefrom, the blades of one shaft adapted to move between the blades of the adjacent shaft in spaced relation therewith, said body portion having an opening. in one wall thereof and arranged on aline extending vertically between the horizontal shafts, and said openingadapted to accommodate'anarticle under treatment, whereby one edge ofV the article is supported within the path of travel of the revolving blades, and engaged on opposite sides thereof, by said blades, sharpening the article.

` OWEN D. P REMO. 

